<!-- 父级页面:控制除了登录页以外的所有子页面的头部与左侧菜单栏 -->
<template>
  <div style="display: flex;">
    <!-- 左侧菜单栏 -->
    <div :style="{width: (isCollapse ? '64px' : '208px')}">
      <el-menu
          background-color="#3c82f5"
          style="width: 100%;height: 100vh;"
          text-color="#fff"
          active-text-color="#ff0"
          unique-opened
          router
          :collapse="isCollapse"
          :collapse-transition="false"
      >
        <el-row style="padding-top: 10px;">
          <el-col :span="2"></el-col>
          <el-col :span="7" style="padding-left: 7px;">
            <el-avatar src="/imgs/admin/logo.png" style="width: 35px;height: 35px;"></el-avatar>
          </el-col>
          <el-col :span="isCollapse ? 0 : 13">
            <span style="color:#fff;font-weight: bold;position: relative;top: 8px;left: 2px">智慧车辆</span>
          </el-col>
        </el-row>
        <el-sub-menu index="1">
          <template #title><el-icon><User/></el-icon><span style="margin-left: 30px">用户管理</span></template>
          <el-menu-item index="/user">用户列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="2">
          <template #title><el-icon><Van/></el-icon><span style="margin-left: 30px">车辆管理</span></template>
          <el-menu-item index="/vehicle">车辆列表</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="3">
          <template #title><el-icon><Location/></el-icon><span style="margin-left: 30px">围栏管理</span></template>
          <el-menu-item index="/geofence">电子围栏</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="4">
          <template #title><el-icon><Place/></el-icon><span style="margin-left: 30px">调度管理</span></template>
          <el-menu-item index="/application">申请列表</el-menu-item>
          <el-menu-item index="/audit">调度审核</el-menu-item>
          <el-menu-item index="/distribute">车辆分配</el-menu-item>
        </el-sub-menu>
        <el-sub-menu index="5">
          <template #title><el-icon><MessageBox/></el-icon><span style="margin-left: 30px">字典管理</span></template>
          <el-menu-item index="/dict">数据字典</el-menu-item>
        </el-sub-menu>
      </el-menu>
    </div>
    <div :style="{width: (isCollapse? 'calc(100% - 64px)' : 'calc(100% - 208px)')}">
      <!-- 右侧顶部条 -->
      <el-header style="padding-top: 22px;height: 10vh;background-color: #fff;">
        <el-row :gutter="10">
          <el-col :span="18">
            <el-icon style="font-size: 20px;" @click="changeCollapsed"><Expand/></el-icon>
          </el-col>
          <el-col :span="6" style="position: relative;">
            <el-dropdown trigger="click" style="position: absolute;right: 20px">
              <span style="font-size: 19px;font-weight: bold;">
                {{ user.username }}
                <el-icon><arrow-down/></el-icon>
              </span>
              <template #dropdown>
                <el-dropdown-menu>
                  <el-dropdown-item @click="logout">退出登录</el-dropdown-item>
                </el-dropdown-menu>
              </template>
            </el-dropdown>
          </el-col>
        </el-row>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator="/" style="position: relative;top: 20px;">
          <el-breadcrumb-item>首页</el-breadcrumb-item>
          <el-breadcrumb-item v-for="item in breadcrumb">{{ item }}</el-breadcrumb-item>
        </el-breadcrumb>
      </el-header>
      <!-- 右侧主体内容(可变区域) -->
      <el-main style="height:90vh;padding:0;overflow-y:auto;">
        <router-view/>
      </el-main>
    </div>
  </div>
</template>

<script setup>
import {onMounted, ref} from "vue";
import {useRoute, useRouter} from "vue-router";

//定义变量用于控制左侧菜单栏是否折叠
const isCollapse = ref(false);
const changeCollapsed = () => {
  isCollapse.value = !isCollapse.value;
}
//定义用户信息
const user = getUser();
//定义一个退出登录的方法
const logout = () => {
  if (confirm("确定要退出登录吗？")){
    //退出时要清空用户数据
    localStorage.removeItem("user");
    //退出后要去到登录页
    window.location.href = "/login";
    //清空取出来的user对象信息
    user.value = '';
  }
}

//定义数组来维护面包屑导航当前的路径
const breadcrumb = ref([]);
//定义对象来维护路由path与面包屑数组值的对应关系
let map ={
  '/user':['用户管理','用户列表'],
  '/vehicle':['车辆管理','车辆列表'],
  '/geofence':['围栏管理','电子围栏'],
  '/geofenceMap':['围栏管理','新增围栏'],
  '/application':['调度管理','申请列表'],
  '/audit':['调度管理','调度审核'],
  '/distribute':['调度管理','车辆分配'],
  '/dict':['数据字典','字典管理'],
  '/dictOption':['数据字典','字典项管理']
};
const route = useRoute();
//定义一个更新面包屑的方法，只要路由发生变化，立即触发更新面包屑
const updateBreadcrumb = (route) => {
  //获取当前路由的path值
  const path = route.path;
  //从map对象中根据path值获取对应的面包屑数组值，并设置到breadcrumb数组中
  breadcrumb.value = map[path];
};
//表示一进到页面立即执行的时机
onMounted(() => {
  //更新面包屑的值--初始化
  updateBreadcrumb(route);
})

//获取一个路由器对象
const router = useRouter();
//监听路由的变化，如果发生了改变
router.beforeEach((to, from, next) => {
  //立即更新面包屑的值
  updateBreadcrumb(to);
  //再进行路由跳转
  next();
})
</script>